You can apply preset styles from the Styles palette. The layer styles that come with Photoshop are grouped into libraries by function. For example, one library contains styles for creating web buttons; another library contains styles adding effects to text. To access these styles, you need to load the appropriate library. For information on loading and saving styles, see Create and manage preset styles.
Normally, applying a preset style replaces the current layer style. However, you can add the attributes of a second style to those of the current style.
Click a style in the Styles palette to apply it to the currently selected layers.
Drag a style from the Styles palette onto a layer in the Layers palette.
Drag a style from the Styles palette to the document window, and release the mouse button when the pointer is over the layer content to which you want to apply the style.
Choose Layer > Layer Style > Blending Options, and click the word Styles in the Layer Styles dialog box (top item in the list on the left side of the dialog box). Click the style you want to apply, and click OK.
When using a shape tool or pen tool in shape layers mode, select a style from the pop‑up palette in the options bar before drawing the shape.
Text Only to view the layer styles as a list.
Small Thumbnail or Large Thumbnail to view the layer styles as thumbnails.
Small List or Large List to view the layer styles as a list, with a thumbnail of the selected layer style displayed.